import java.util.Scanner;

/**
 * @author: gao
 * @create-date: 2025/3/15 8:13
 */

public class Solution {
    public int peakIndexInMountainArray(int[] arr) {
        int left = 1,right = arr.length - 2;
        while(left < right){
            int mid = left + (right - left + 1)/2;
            if(arr[mid] > arr[mid - 1]) left = mid;
            else right = mid - 1;
        }
        return left;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while(in.hasNextInt()){
            int size = in.nextInt();
            int[] arr = new int[size];
            for (int i = 0; i < size; i++) {
                arr[i] = in.nextInt();
            }
            Solution solution = new Solution();
            System.out.println(solution.peakIndexInMountainArray(arr));
        }
    }
}